The Isabella tiger moth (scientific name: Pyrrharctia isabella) is a medium-sized moth with a wingspan typically ranging from 1¼ to 2 inches. Its body length measures approximately 15⁄16 inch.
Detailed Dimensions and Appearance
To better understand the size of an Isabella tiger moth, here's a quick overview of its key measurements:
| Measurement | Range / Value |
|---|---|
| Wingspan | 1¼″ to 2″ |
| Total Length | 15⁄16″ |
Beyond these dimensions, the adult moth has several distinctive physical characteristics. Its thorax is densely covered with long, soft brown or yellowish-brown hairs, giving it a somewhat fuzzy appearance. The abdomen is brightly colored, typically orange, and features a prominent upper (dorsal) row of black spots. The forewings are pointed and present a uniform light to medium orangish-brown coloration, which can provide excellent camouflage against tree bark or dry leaves.
Understanding the Isabella Tiger Moth
While the adult moth is notable for its size and distinctive markings, it is perhaps even more famous in its larval stage as the "woolly bear" caterpillar. These caterpillars are easily recognized by their dense, stiff, black, and reddish-brown bristles.
Life Cycle and Habitat
The Isabella tiger moth undergoes a complete metamorphosis, transitioning from egg to larva (woolly bear caterpillar), pupa, and finally to the adult moth.
- Caterpillar Stage: Woolly bear caterpillars are known for their ability to survive cold temperatures by producing a natural antifreeze called glycerol, allowing them to freeze solid and thaw without harm.
- Adult Moth: Adult moths are nocturnal and are often attracted to lights. They are important pollinators for various plants.
For more information on the Isabella tiger moth's lifecycle and behavior, you can explore resources like the Wikipedia page for Isabella tiger moth or entomology guides.
